COVID-19 vaccine boosters provided small boosts for people who have recovered from COVID-19, according to a new study.
Measuring the effectiveness of the Moderna and Pfizer boosters against the BA.1 Omicron subvariant, researchers found that a booster upped protection against infection by just 6.1 percent for those who had a documented prior infection, or natural immunity.
The effectiveness of a primary series 14 to 149 days after a second dose was pegged as 41 percent for the group. A booster brought the protection to 47.1 percent.
Excluding people with a documented prior infection, the booster increased infection more.
People without documentation of a COVID-19 infection had 27.1 percent protection after a primary series. A booster increased that to 54.1 percent….